Dana will go on a crash diet on the new reality TV show. Capture from Lifetime's YouTube account

By Dong Sun-hwa

Dana will be featured in "Fly Again Dana." Capture from Lifetime's YouTube account

K-pop singer and musical actress Dana has taken fans by surprise by displaying her overweight body in a teaser for a coming reality TV show ― in stark contrast with the well-toned, skinny body she used to flaunt on TV. Watch the teaser: bit.ly/2D5YQhF"I've gained weight a lot," Dana said in a low voice in the clip posted Monday on cable channel Lifetime's YouTube account. "People will be shocked when they see me. I was shocked (by my looks) too." She didn't say why she gained so much weight. Dana said she was ready to endure "painstaking time and effort" to lose weight. The clip was a teaser for Lifetime's new reality show "Fly Again Dana." The first episode will air on Nov. 21. The program will offer a close look at how the singer sheds weight.

Dana said she would try her best to lose weight. Capture from Lifetime's YouTube account

Dana, whose name is Hong Sung-mi, debuted as a soloist in 2001 and joined The Grace in 2005. She also appeared in musicals including "Rock of Ages" in 2010 and "Robin Hood" in 2015. She reportedly broke up with her boyfriend recently.